I came accross the following rare issue:
setpgid03 1 TPASS : setpgid SUCCESS to set errno to EPERM
setpgid03 2 TFAIL : setpgid FAILED, expect EACCES got 1
I suppose It may happen if the test host is under stress.
To prevent this It would be better to use SIGUSR1 for parent-child
synchronisations.
Signed-off-by: Stanislav Kholmanskikh <stanislav.kholmansk...@oracle.com>
---
testcases/kernel/syscalls/setpgid/setpgid03.c | 123 +++++++++++++++++++++++--
1 files changed, 115 insertions(+), 8 deletions(-)
diff --git a/testcases/kernel/syscalls/setpgid/setpgid03.c
b/testcases/kernel/syscalls/setpgid/setpgid03.c
index 2c47bc4..34975b7 100644
--- a/testcases/kernel/syscalls/setpgid/setpgid03.c
+++ b/testcases/kernel/syscalls/setpgid/setpgid03.c
@@ -1,5 +1,6 @@
/*
* Copyright (c) International Business Machines Corp., 2001
+ * Copyright (c) 2013 Oracle and/or its affiliates. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -34,15 +35,20 @@
char *TCID = "setpgid03";
int TST_TOTAL = 1;
+static pid_t pid = -1;
+
static void do_child(void);
+static void sigusr_handler(int signum);
+static void term_handler(int signum);
static void setup(void);
static void cleanup(void);
int main(int ac, char **av)
{
- int pid;
int rval;
int status;
+ sigset_t sig_set;
+ struct sigaction sa;
int lc;
char *msg;
@@ -56,12 +62,42 @@ int main(int ac, char **av)
setup();
+ /* We need to block these signals before fork()
+ * because our children may terminate either
+ * normally (parent receives both SIGUSR1 and SIGCHLD) or
+ * abnormally (parent receives SIGCHLD only)
+ */
+ sigemptyset(&sig_set);
+ sigaddset(&sig_set, SIGUSR1);
+ sigaddset(&sig_set, SIGCHLD);
+
+ /* Since we use SIGUSR1 as a control signal It should not
+ * be an "unexpected" one
+ */
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = sigusr_handler;
+ if (sigaction(SIGUSR1, &sa, NULL) < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup, "sigaction(SIGUSR1) failed");
+
+ /* But for SIGINT, SIGTERM we should kill our children */
+ sa.sa_handler = term_handler;
+ if (sigaction(SIGTERM, &sa, NULL) < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup, "sigaction(SIGTERM) failed");
+ if (sigaction(SIGINT, &sa, NULL) < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup, "sigaction(SIGINT) failed");
+
for (lc = 0; TEST_LOOPING(lc); lc++) {
tst_count = 0;
//test1:
/* sid of the calling process is not same */
+
+ if (sigprocmask(SIG_BLOCK, &sig_set, NULL) < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup,
+ "sigprocmask(SIG_BLOCK) in test 1 failed");
+
+
if ((pid = FORK_OR_VFORK()) == -1) {
tst_brkm(TBROK, cleanup, "fork() failed");
}
@@ -76,7 +112,14 @@ int main(int ac, char **av)
#endif
}
- sleep(1);
+ if (sigwaitinfo(&sig_set, NULL) < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup,
+ "sigwaitinfo() failed");
+
+ if (sigprocmask(SIG_UNBLOCK, &sig_set, NULL) < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup,
+ "sigprocmask(SIG_UNBLOCK) in test 2 failed");
+
rval = setpgid(pid, getppid());
if (errno == EPERM) {
tst_resm(TPASS,
@@ -86,11 +129,14 @@ int main(int ac, char **av)
"setpgid FAILED, expect %d, return %d",
EPERM, errno);
}
- sleep(1);
+
+ kill(pid, SIGUSR1);
if (wait(&status) < 0)
tst_resm(TFAIL | TERRNO, "wait() for child 1 failed");
+ pid = -1;
+
if (!(WIFEXITED(status)) || (WEXITSTATUS(status) != 0))
tst_resm(TFAIL, "child 1 failed with status %d",
WEXITSTATUS(status));
@@ -100,18 +146,47 @@ int main(int ac, char **av)
* Value of pid matches the pid of the child process and
* the child process has exec successfully. Error
*/
+
+ if (sigprocmask(SIG_BLOCK, &sig_set, NULL) < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup,
+ "sigprocmask(SIG_BLOCK) in test 2 failed");
+
if ((pid = FORK_OR_VFORK()) == -1) {
tst_resm(TFAIL, "Fork failed");
}
if (pid == 0) {
- if (execlp("sleep", "sleep", "3", NULL) < 0) {
- perror("exec failed");
+ char buf[10];
+ int ret;
+
+ ret = snprintf(buf, 10, "%d", getppid());
+ if ((ret >= 10) || (ret <= 0)) {
+ printf("snprintf() failed\n");
+
+ exit(126);
}
+
+ const char *args[4 + 1];
+ args[0] = "kill";
+ args[1] = "-s";
+ args[2] = "SIGUSR1";
+ args[3] = buf;
+ args[4] = NULL;
+
+ if (execvp(args[0], (char *const *)args) < 0)
+ perror("execvp() failed\n");
+
exit(127);
}
- sleep(1);
+ if (sigwaitinfo(&sig_set, NULL) < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup,
+ "sigwaitinfo() failed");
+
+ if (sigprocmask(SIG_UNBLOCK, &sig_set, NULL) < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup,
+ "sigprocmask(SIG_UNBLOCK) in test 2 failed");
+
rval = setpgid(pid, getppid());
if (errno == EACCES) {
tst_resm(TPASS,
@@ -124,6 +199,8 @@ int main(int ac, char **av)
if (wait(&status) < 0)
tst_resm(TFAIL | TERRNO, "wait() for child 2 failed");
+ pid = -1;
+
if (!(WIFEXITED(status)) || (WEXITSTATUS(status) != 0))
tst_resm(TFAIL, "child 2 failed with status %d",
WEXITSTATUS(status));
@@ -136,18 +213,48 @@ int main(int ac, char **av)
static void do_child(void)
{
int exno = 0;
+ sigset_t set;
if (setsid() < 0) {
printf("setsid() failed, errno: %d\n", errno);
exno = 1;
}
- sleep(2);
+
+ kill(getppid(), SIGUSR1);
+
+ sigemptyset(&set);
+ sigaddset(&set, SIGUSR1);
+ if (sigprocmask(SIG_UNBLOCK, &set, NULL) < 0) {
+ printf("sigprocmask() in child failed: %d\n", errno);
+
+ exit(1);
+ }
+
+ pause();
+
exit(exno);
}
-static void setup(void)
+static void sigusr_handler(int signum)
{
+}
+
+static void term_handler(int signum)
+{
+ if (pid == 0) {
+ printf("Child received signal %d\n", signum);
+ exit(1);
+ } else {
+ if (pid > 0)
+ kill(pid, signum);
+
+ tst_brkm(TFAIL, cleanup, "Signal %d received. Exiting", signum);
+ }
+}
+
+static void setup(void)
+{
tst_sig(FORK, DEF_HANDLER, cleanup);
umask(0);
--
1.7.1
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